iSCSI/sendto(...)

[Scott Long]

Danny Braniss wrote:
>>Danny Braniss wrote:
>>
>>
>>>Hi,
>>>	on a fairly new 6.1-stable, and probably before, once in a
>>>blue moon, sendto return error 64 (EHOSTDOWN?). but the packet seems to have
>>>been received by the target, since i get a response, and further more,
>>>everything keeps on working.
>>>
>>>what is error 64?
>>>
>>>danny
>>>
>>>
>>
>>EHOSTDOWN comes from the ARP layer of the IP stack, and would be
>>consistent with the host either getting no arp response or rejected
>>responses from the target.  It would be useful to run tcpdump+ethereal
>>on your connection to see what is really going on.
>>
> 
> too much traffic, and would be like looking for a needle in a haystack.
> (i can't reproduce this at will)
> the question is, if it was an error, how come the packet did go out.
> need more proof for the above statement - working on it.
> 
> danny
> 
> 
> 
> 

I find that ethereal does a great job of associating packets and making
it easy to sort through mountains of data.  It's not so good at actually
collecting the packets, so I run tcpdump in raw collection mode and then
feed the output to ethereal for analysis.  Having tcpdump generate a
circular ring of files that are at most 20MB works best.

Scott